#158 Replace gulp

package.json

 {
   "name": "GradeRatingSystem",
-  "version": "1.2.0",
+  "version": "2.0.1",
   "devDependencies": {
-    "babel-preset-es2015": "^6.9.0", 
-    "babel-preset-es2015-without-strict": "0.0.2",
-    "gulp": "^3.9.1",
-    "gulp-autoprefixer": "^3.1.0",
-    "gulp-babel": "^6.1.2",
-    "gulp-changed": "^1.3.0",
-    "gulp-filter": "^4.0.0",
-    "gulp-jsbeautifier": "^2.0.3",
-    "gulp-less": "^3.1.0",
-    "gulp-minify-css": "^1.2.4",
-    "gulp-uglify": "^1.5.3",
-    "gulp-apidoc": "^0.2.4",
-    "lazypipe": "^1.0.1",
-    "minimist": "^1.2.0",
-    "through": "^2.3.8"
+    "babel-preset-es2015": "6", 
+    "babel-preset-es2015-without-strict": "0",
+    "del": "2",
+    "gulp": "3",
+    "gulp-apidoc": "0",
+    "gulp-autoprefixer": "3",
+    "gulp-babel": "6",
+    "gulp-cssnano": "2",
+    "gulp-less": "3",
+    "gulp-uglify": "2",
+    "lazypipe": "1",
+    "through": "2"
   }
 }